When his wife returned from abroad, Kevin ____ his paintings at the art museum in his hometown.
The flu is believed _______ by viruses that like to reproduce in the cells inside the human nose and throat.
We often provide our children with toys,footballs or basketballs, _______ that all children like these things.
The Olympic mascots are the Olympic flame, the fish, the panda, the Tibetan antelope and the swallow, _______ a close group of friends.
I send you 100 dollars today,the rest _______ in a year.
Mary was caught in a traffic jam and by the time she arrived at the airport her father’s plane_______.